APC AXFA11G User Manual download pdf (Page 99)

IM 01E20C01-01E

9-1

9. ACTUAL OPERATION

After you have installed the flowtube into the process

piping, wired the input/output terminals, set up the

required parameters, and performed a pre-operation

zero adjustment, the magnetic flowmeter should output

an accurate flow signal from its terminals as soon as

flow of the fluid to be measured begins. This section

describes zero adjustment and the corresponding

procedures.

9.1 Pre-operation Zero

Adjustment

Zero adjustment is carried out to ensure that the output

for zero flow is 0% (i.e., 4 mA). Although adjustment

to zero is performed at the manufacturing plant prior to

shipment, this procedure must be carried out once

again following the installation of piping in order to

match the magnetic flowmeter to its operating condi-

tions.

This section describes the zero adjustment procedure

using display unit switches from the converter and

using the external status input; accordingly, one of

these methods should be selected and implemented.

IMPORTANT

• Zero adjustment should be carried out before

actual operation. Note that setting and update

functions cannot be carried out during this

procedure (i.e., for approximately 30 seconds).

• Zero adjustment should only be carried out

when the flowtube has been filled with fluid and

the fluid velocity is completely zero by closing

the valve.

• Each time that the fluid being measured is

changed, it will be necessary for zero adjust-

ment to be carried out for the new fluid.

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APC AXFA11G User Manual Page 99